Spiraling pathways of global deep waters to the surface of the Southern Ocean

Tamsitt, Veronica; Drake, Henri F.; Morrison, Adele K.; Talley, Lynne D.; Dufour, Carolina O.; Gray, Alison R.; Griffies, Stephen M.; Mazloff, Matthew R.; Sarmiento, Jorge L.; Wang, Jinbo; Weijer, Wilbert

doi:10.1038/s41467-017-00197-0

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Spiraling pathways of global deep waters to the surface of the Southern Ocean

2017
By Tamsitt, Veronica ; Drake, Henri F. ; Morrison, Adele K. ; ...
Source: Nature Communications 8 (172)

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Journal Title:

Nature Communications
Personal Author:

Tamsitt, Veronica ; Drake, Henri F. ; Morrison, Adele K. ; Talley, Lynne D. ; Dufour, Carolina O. ; ... More +

Tamsitt, Veronica ; Drake, Henri F. ; Morrison, Adele K. ; Talley, Lynne D. ; Dufour, Carolina O. ; Gray, Alison R. ; Griffies, Stephen M. ; Mazloff, Matthew R. ; Sarmiento, Jorge L. ; Wang, Jinbo ; Weijer, Wilbert Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; GFDL (Geophysical Fluid Dynamics Laboratory)

OAR (Oceanic and Atmospheric Research) ; GFDL (Geophysical Fluid Dynamics Laboratory) Less -
Description:

Upwelling of global deep waters to the sea surface in the Southern Ocean closes the global overturning circulation and is fundamentally important for oceanic uptake of carbon and heat, nutrient resupply for sustaining oceanic biological production, and the melt rate of ice shelves. However, the exact pathways and role of topography in Southern Ocean upwelling remain largely unknown. Here we show detailed upwelling pathways in three dimensions, using hydrographic observations and particle tracking in high-resolution models. The analysis reveals that the northern-sourced deep waters enter the Antarctic Circumpolar Current via southward flow along the boundaries of the three ocean basins, before spiraling southeastward and upward through the Antarctic Circumpolar Current. Upwelling is greatly enhanced at five major topographic features, associated with vigorous mesoscale eddy activity. Deep water reaches the upper ocean predominantly south of the Antarctic Circumpolar Current, with a spatially nonuniform distribution. The timescale for half of the deep water to upwell from 30 degrees S to the mixed layer is similar to 60-90 years.
Keywords:

[+]

Physical Oceanography Upwelling (Oceanography)
Source:

Nature Communications 8 (172)
DOI:

https://doi.org/10.1038/s41467-017-00197-0
Pubmed Central ID:

PMC5541074
Document Type:

Journal Article
Place as Subject:

Antarctic Ocean
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CC BY
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PMC
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urn:sha256:cc33e4b6119f7ff5d09b180de0639f563856d95641b52f50044d3a7329450f4a
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https://repository.library.noaa.gov/view/noaa/24137/noaa_24137_DS1.pdf
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Tamsitt_NatComm_2017Corr.pdf

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